Eutrophication and Dead Zones

Which of the following is NOT a source of nitrates and phosphates into a river?

• Fertilizers

• Animal waste

• Wastewater

• Burning fossil fuels

True or False: Fertilizers used for growing crops always stay within the boundaries of the farm.

• True

• False

In a dead zone, _________ levels are really low such that living organisms are not able survive.

• nitrogen

• oxygen

• fertilizer

• carbon dioxide

Based on the diagram, which fish species is in a breeding zone with higher oxygen levels?

• Fish Species 1

• Fish Species 2

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The long term effects of a dead zone includes all of the following except for

• Fisherman may struggle to catch any fish.

• The crops of farmers stop growing.

• The health of the fish population declines.

• There is an increase in the population of decomposers such as bacteria.

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The size of dead zones will ________ with more nitrogen run-off.

• Increase

• Stay the same

• Decrease

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An increase in the amount of nutrients in a lake is known as

• calcification

• cellular respiration

• eutrophication

• photosynthesis

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Fertilizer, sewage, and animal feces can wash in to water, leading to...

• thermal pollution

• eutrophication

• photosynthesis

• noise pollution

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The natural process of eutrophication is accelerated when you add...

• phosphates and nitrates

• nitrates and oxygen

• biodiversity

• oil and heat

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Which type of pollution can lead to harmful "algal blooms"?

• thermal pollution

• oil spills

• nutrient pollution

• bacteria

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